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Let's look at this from the most basic angle.
When something won't go into a hole, there's SOMETHING that's too big.
With a cartridge, it can be too long, too fat or have too much headspace (which is a variation of being too long).
Too long means the brass has stretched and is now too long to fit. Check the length of sized brass and trim it if necessary. You must size it first because sizing causes it to grow.
The other "too long" is headspace, and that is usually fixed by the sizer - assuming the die is set up properly. There are exceptions but, at least initially, make sure the shellholder makes firm contact with the die at the top of the stroke.
The "too fat" can happen if you are trying to crimp (or crimping unintentionally, too!). Most rifles do not need crimping, so make sure the crimp lip inside the seater die doesn't ever touch the brass. Run a sized but empty case into the seater (no bullet) and make sure the die doesn't touch it.
This isn't meant to talk down to you, Ken. Sometimes the only way I can figure out a problem is to go back to the very basics and walk myself through it. It works for me.
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